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Added path for devices that don't support multiDrawIndirect, resource cleanup on destruction

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saschawillems 2016-08-04 18:57:32 +02:00
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indirectdraw/README.md
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@ -7,8 +7,7 @@
Issue multiple instanced draws for different meshes in one single draw call using indirect draw commands.
## Requirements
The example requires a GPU that supports the [`multiDrawIndirect`](http://vulkan.gpuinfo.org/listreports.php?feature=multiDrawIndirect) feature. If this feature is not available, the `drawCount` parameter for the `vkCmdDrawIndexedIndirect` call must be 1.
When issuing many draw counts also make sure to stay within the limitations of [`maxDrawIndirectCount`](http://vulkan.gpuinfo.org/listreports.php?limit=maxDrawIndirectCount).
If the [`multiDrawIndirect`](http://vulkan.gpuinfo.org/listreports.php?feature=multiDrawIndirect) feature is supported, only one draw call is issued for the plants. If this feature is not available multiple indirect draw commands are used. ***Note:*** When issuing many draw counts also make sure to stay within the limitations of [`maxDrawIndirectCount`](http://vulkan.gpuinfo.org/listreports.php?limit=maxDrawIndirectCount).
## Description
@ -74,7 +73,7 @@ vulkanDevice->copyBuffer(&stagingBuffer, &indirectCommandsBuffer, queue);
To use a buffer for indirect draw commands you need to specify the ```VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT``` usage flag at creation time. As the buffer is never again changed on the host side we stage it to the GPU to maximize performance.
### Rendering
Issuing the actual indirect draw command is pretty straightforward:
If the [`multiDrawIndirect`](http://vulkan.gpuinfo.org/listreports.php?feature=multiDrawIndirect) is supported, we can issue all indirect draws with one single draw call:
```cpp
void buildCommandBuffers()
{
@ -97,5 +96,14 @@ for (auto indirectCmd : indirectCommands)
}
}
```
If the GPU does not support ```multiDrawIndirect``` we have to issue the indirect draw commands one-by-one using a buffer offset instead:
```cpp
for (auto j = 0; j < indirectCommands.size(); j++)
{
vkCmdDrawIndexedIndirect(drawCmdBuffers[i], indirectCommandsBuffer.buffer, j * sizeof(VkDrawIndexedIndirectCommand), 1, sizeof(VkDrawIndexedIndirectCommand));
}
```
### Acknowledgements
- Plant and foliage models by [Hugues Muller](http://www.yughues-folio.com/)